We recently ran into the "Warning: Changes to unknown property ...
will not be detected" compiler issue. All the usual tricks did not
work and the FAQ did not help.
This problem is often the result of the binding being
more agressive than needed in "dot down" situations. The curly brace
syntax is being used for both binding and "expression evaluation"
So, if you are referencing foo.bar.baz.boz, you can often get away
with a binding trigger on a prefix of the expression, (e.g., foo.bar)
and then evaluating the rest without binding (e.g., .baz.bar). That
is, it is often the case that baz and boz change if and only if foo
or bar changes (and that flex knows the types of foo and bar) I
suspect this is true in most deeply nested "dot down" situations.
In this case you can get around the compiler warning by tricking Flex
to trigger on the prefix.
For example:
public static function bindingFixer(object:Object) : Object {
return object;
}
<mx:Label text="{Util.bindingFixer(foo.bar).baz.buz}"/>
The function call is enough to cause flex to trigger binding on
foo.bar alone, but the expression is evaluated more/less as
foo.bar.baz.buz.
Is this worthy of incorporation into the FAQ?
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